Question

The mean of first "n" odd natural numbers is n²/81, then n= a)81. b)18. c)27. d)54​

Answer 1

Answer:

$value \: of \: n = 81 \\ sum \: of \: n \: odd \: natural \: numbers = {n}^{2} \\ according \: to \: the \: given \: prolem .\: \\ \\ the \: mean \: of \: first \: n \: odd \: natural \: number \: is \: </p><p>\frac{ {n}^{2} }{81} \\ </p><p>=>mean = \frac{ {n}^{2} }{81} / given* \\ = > \frac{sum \: of \: obsevations \: }{numbers \: of \: observations} = \frac{ {n}^{2} }{81} \\ after \: cancel \: we \: get \\ = > \frac{1}{n} = \frac{1}{81} \\ = >n = 81 \\ hope \: it \: help \: you \\ pls \: follow \: me \: and \: mark \: as \: brainlist$

ans=(a)